220204 2020-12-30 15:54:39 -0800 [JSC] bluenoise script takes too long time 2022-02-12 19:47:30 -0800 1 1 1 Unclassified WebKit JavaScriptCore WebKit Nightly Build Unspecified Unspecified RESOLVED DUPLICATE 220254 InRadar P2 Normal --- 220254 220219 1 ysuzuki ysuzuki bfulgham krollin mark.lam simon.fraser webkit-bug-importer oldest_to_newest 1716876 0 ysuzuki 2020-12-30 15:54:39 -0800 This sounds like some optimization failure in DFG/FTL. We should fix. https://twitter.com/DasSurma/status/1344325758089650178 1716880 1 webkit-bug-importer 2020-12-30 16:07:12 -0800 <rdar://problem/72744961> 1716949 2 ysuzuki 2021-01-01 01:43:31 -0800 OK, this is not something simple issue. The main reason why this takes some time is that, valueAt and setValueAt are not inlined. Their callers and callees are creating objects frequently (return value / parameter). If they are inlined, FTL compiler knows that these objects are not escaped so we can completely eliminate object allocations for them. However, if they are not inlined, we need to allocate them since it is escaped inside this function. This is the reason why they are slow. And why they are not inlined is because they are complex enough and taking enough amount of bytecodes which prevents inlining. 1716952 3 ysuzuki 2021-01-01 04:14:12 -0800 https://bugs.webkit.org/show_bug.cgi?id=220219 does not fix this. But it slightly removes unnecessary bytecodes that can be seen commonly. 1717198 4 ysuzuki 2021-01-04 13:49:42 -0800 Let's fix this with https://bugs.webkit.org/show_bug.cgi?id=220254 1840816 5 bfulgham 2022-02-12 19:47:30 -0800 *** This bug has been marked as a duplicate of bug 220254 ***